Fuel Pressure Regulator Assembly

Fig 1: View Of Fuel Pulse Dampener

Courtesy of GENERAL MOTORS CORP.

The fuel pressure regulator attaches to the fuel return pipe on the fuel sender assembly. The fuel pressure regulator is a diaphragm-operated relief valve. A software bias compensates the injector on-time because the fuel pressure regulator is not referenced to manifold vacuum. The injector pulse width varies with the signal from the MAP sensor.